Chemistry - Covalent bonding

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Which type of elements form covalent bonds?
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Two non-metals.
Which types of elements form non-covalent bonds?
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A non-metal and a metal.
Does covalent bonding involve gaining / losing electrons?
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No, electrons are shared.
What is shared in a single covalent bond?
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One pair of electrons.
Why are covalent bonds strong?
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Because of the strong attraction between shared electrons and the nuclei.
Why can nitrogen bond with three hydrogens?
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Because nitrogen needs three more electrons and each hydrogen shares one.
How many covalent bonds does nitrogen form in ammonia?
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Three covalent bonds.
Why do chlorine atoms form covalent bonds?
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Each chlorine atom needs one more electron for a full outer shell.
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